Retried with Kina L'Aero d'Or (now that I have some), using Angostura Orange Bitters and Remy 1738. (I think I prefer an arcadian idyll lubricated by cognac.) Instead of orange curacao I substituted P. Ferrand Limited Edition Late Harvest Moroccan Yuzu Dry Curacao, which we both agree really made this cocktail exceptional. Five stars.